Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net interest income	$ 1,837,864	$ 1,495,362	$ 1,124,957
Provision for credit losses	114,390	78,589	(59,263)
Non-interest income	434,106	461,053	586,120
Non-interest expense	1,312,499	1,177,271	1,132,544
Income tax expense	222,455	190,873	171,645
Net income	622,626	509,682	466,151
Total assets at end of year	56,259,934	52,949,649	50,142,143
Operating Segments
Segment Reporting Information [Line Items]
Net interest income	1,802,755	1,465,183	1,098,374
Provision for credit losses	114,390	78,589	(59,263)
Non-interest income	505,576	520,882	647,471
Non-interest expense	1,348,860	1,206,921	1,167,312
Income tax expense	222,455	190,873	171,645
Net income	622,626	509,682	466,151
Total assets at end of year	56,259,934	52,949,649	50,142,143
Operating Segments | Community Banking
Segment Reporting Information [Line Items]
Net interest income	1,440,975	1,180,198	868,477
Provision for credit losses	104,895	74,184	(60,309)
Non-interest income	263,023	298,572	422,698
Non-interest expense	1,036,432	926,298	912,296
Income tax expense	148,612	128,939	120,092
Net income	414,059	349,349	319,096
Total assets at end of year	44,355,786	41,368,200	40,253,818
Operating Segments | Specialty Finance
Segment Reporting Information [Line Items]
Net interest income	329,044	246,681	197,958
Provision for credit losses	9,495	4,405	1,046
Non-interest income	105,992	97,701	95,822
Non-interest expense	186,513	172,784	143,526
Income tax expense	63,484	46,286	40,040
Net income	175,544	120,907	109,168
Total assets at end of year	10,664,887	9,826,254	8,382,722
Operating Segments | Wealth Management
Segment Reporting Information [Line Items]
Net interest income	32,736	38,304	31,939
Provision for credit losses	0	0	0
Non-interest income	136,561	124,609	128,951
Non-interest expense	125,915	107,839	111,490
Income tax expense	10,359	15,648	11,513
Net income	33,023	39,426	37,887
Total assets at end of year	1,239,261	1,755,195	1,505,603
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net interest income	35,109	30,179	26,583
Provision for credit losses	0	0	0
Non-interest income	(71,470)	(59,829)	(61,351)
Non-interest expense	(36,361)	(29,650)	(34,768)
Income tax expense	0	0	0
Net income	0	0	0
Total assets at end of year	$ 0	$ 0	$ 0